"Do you know how often you have to use the bathroom when you're drinking a gallon, especially in the middle of the night?" Jordan said. "You're trying to sleep; you've got to wake up and use the bathroom. You're like, 'Oh my God. I'm just going to hold it.' It just doesn't quite work out."

It is true that Jordan's exact fitness regimen, with a devoted personal trainer, meticulously planned workouts based on the movie that's being filmed, and multiple scheduled workouts a day, may not be accessible for everyone.

But it does contain some basic guidelines that just about anyone can use — start small, work your way up, drink your water, and see where that takes you.